A video of singer named Shivang Upadhyay singing Shankar Mahadevan's 'Breathless' song in the voices of 21 singers in 55 seconds has gone viral. The singers included AR Rahman, Sonu Nigam, Vishal Dadlani, Javed Ali, KK, Kailash Kher, Arijit Singh, Adnan Sami, Jagjit Singh, Atif Aslam, Shaan and Papon, among others. Shivang said it took him two months of practice.